WO1995026821A1 - Procede et appareil de regeneration de resines dans un appareil echangeur d'ions du type a deux lits fixes - Google Patents

Procede et appareil de regeneration de resines dans un appareil echangeur d'ions du type a deux lits fixes Download PDF

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Publication number
WO1995026821A1
WO1995026821A1 PCT/CN1995/000021 CN9500021W WO9526821A1 WO 1995026821 A1 WO1995026821 A1 WO 1995026821A1 CN 9500021 W CN9500021 W CN 9500021W WO 9526821 A1 WO9526821 A1 WO 9526821A1
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WO
WIPO (PCT)
Prior art keywords
regeneration
resin
resins
water
bed
Prior art date
Application number
PCT/CN1995/000021
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English (en)
Chinese (zh)
Inventor
Tingsheng Wang
Original Assignee
Tingsheng Wang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN 94240045 external-priority patent/CN2198264Y/zh
Priority claimed from CN94119829A external-priority patent/CN1107808A/zh
Application filed by Tingsheng Wang filed Critical Tingsheng Wang
Priority to DE19581621T priority Critical patent/DE19581621T1/de
Priority to AU21081/95A priority patent/AU2108195A/en
Priority to US08/716,197 priority patent/US5955510A/en
Priority to GB9620404A priority patent/GB2303802B/en
Publication of WO1995026821A1 publication Critical patent/WO1995026821A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
    • B01J49/05—Regeneration or reactivation of ion-exchangers; Apparatus therefor of fixed beds

Definitions

  • the invention relates to a method and a device for regenerating an ion exchange resin in a water treatment device, in particular to a method and a device for regenerating a fixed-type double-bed ion exchange resin.
  • the double-bed ion exchange resins are weak ion exchange resins and strong ion exchange resins. Background technique
  • Bunk bed ion exchange resin water treatment device (hereinafter referred to as the bunk bed) has been widely concerned for its unique advantages since its introduction. Therefore, when using this kind of bunk bed, in order to obtain good effluent quality, it is required that the strong and weak resins maintain a good separation state, that is, the strong and weak resins should have sufficient wet true density difference to facilitate hydraulic reaction. Screening to achieve the purpose of layering. It is generally required that the wet true density difference of the male bunk bed should be greater than 0.09, and the female bunk bed should be greater than 0.04-0.051. However, after the failure of the resin, the difference between the wet true density of the two is too small, and it is difficult to delaminate, especially for a double bed composed of anion exchange resin. This problem is more prominent, so it limits the development and application of this process.
  • Japanese Patent Application Sho 62--284999 describes a two-chamber ion exchange resin bed apparatus, Japanese Patent Application Publication i Green 59--29902 It discloses a double-chamber double-floating floating bed device.
  • the above two devices are provided with an intermediate partition between the strong and weak resins. This partition only allows the wave body to pass, but does not allow the resin to pass, thus preventing it.
  • the two resins are mixed with each other.
  • this method should be able to solve the above-mentioned problem of difficult stratification, but in actual production operation, a cleaning ⁇ needs to be set in vitro to periodically clean the resin in vitro. Because the two resins share the same system, if the resin is not completely transferred, or if the resin is present in a dead corner of the pipe or due to improper operation; and if the intermediate water chamber fails (such as the water cap is loose or damaged), it is unavoidable. There will be a mixture of two resins.
  • the two resins in the double-chamber fixed bed cannot be effectively compacted, and it is easy to "chatter layers" during countercurrent regeneration, which makes the regeneration effect unsatisfactory; while the double-chamber floating bed does not have large backwashing during regeneration, the organic matter retained by the resin, suspension
  • colloidal silicon cannot be removed by backwashing each time, which causes serious resin pollution, reduced exchange capacity, severe resin fragmentation, and the upper protective layer cannot be completely regenerated, which makes the regeneration effect unsatisfactory or even unqualified. Raised acid and alkali.
  • the broken resin is also blocked in the gap of the ice cap in the middle water chamber, causing water flow.
  • the cloth is uneven, the running resistance is increased, it is not good for operation and regeneration, and it is very difficult to clean the broken resin in the gap between the water caps. It is also necessary to set up external resin scrubbing tank equipment. The system and equipment structure are also more complicated, thus increasing equipment investment And floor space, regeneration operations are also more troublesome.
  • an object of the present invention is to provide a new method for regenerating a double-bed ion exchange resin, which can effectively resolve the separation of double-bed resins through a chemical transformation and hydraulic sieving simultaneous layering method. Problems such as layer problems and resin regeneration "disorganized layers", and improve the space utilization of the equipment.
  • Another object of the present invention is to provide a double-bed ion exchange resin water treatment apparatus / resin regeneration apparatus using the regeneration method of the present invention.
  • the invention relates to a method for regenerating a double-bed ion exchange resin, said method comprising the following steps: ⁇
  • the invention also relates to a fixed type double bed ion exchange water treatment device / resin regeneration device adopting the regeneration method of the invention, which includes top and bottom inlet and drainage devices, a casing, an upper row device for regeneration, and a weak acid ( Alkali) resin layer
  • a strong acid (alkali) resin layer is characterized in that a lower row device for regeneration is also provided on the interface between the two resins in the inner cavity of the casing (below).
  • the regeneration method and device of the double-bed ion exchange resin of the present invention have the following advantages:
  • the regeneration method of the present invention uses a regeneration wave with a high flow rate and a low concentration, the backwashing resin and the regeneration and delamination of the resin can be performed simultaneously, thereby simplifying the operation steps, saving backwash water, reducing the amount of self-retaining water and The amount of wastewater discharged, and the density of the waste regeneration wave is greater than that of water, which makes it easier to remove suspended matter and broken resin, and the anti-clog effect is better.
  • the weak resin was first regenerated, while the strong resin remained mostly inactive, which increased the difference in wet true density between the two resins, and the resin stratification effect was good.
  • the regeneration method of the present invention can reduce the backwash expansion space of the bunk bed equipment, and improve the volume utilization rate of the equipment.
  • the upper row device in the present invention is located at 100 to 200 mm below the surface of the upper resin layer, and its relative degree increases with the increase of the space occupied by the resin.
  • the device of the present invention has no external large and small hydraulic backwash pipeline system, which makes the system simpler and more convenient to realize program control and automation.
  • the invention is further described below with reference to the drawings and embodiments.
  • the fixed type double-bed ion exchange water treatment device / resin regeneration device of the present invention includes: a casing 1; an ice inlet pipe 1 1, a water inlet valve worker, and a water inlet distribution device 1 provided on the top of the device; 3; a top row pipe 12 and a top row valve V 2 provided on the top of the device to scavenge waste waves; a weak ion exchange resin (layer) ⁇ provided in the housing 1, which is an upper bed, and Strong ion-exchange resin (layer) B, which is the lower bed; a regeneration liquid upper row pipe 15 is provided at the upper position of the upper bed A, which is connected to the regeneration wave upper row distribution device 14 in the bed A An upper row valve V 3 is also provided on the upper row pipe 15; a regeneration row lower row pipe 17 is arranged between the bed A and the bed layer B, and it is allocated to the lower row row of the regeneration wave provided in the bed A apparatus 16 is connected to the discharge tube 17 is also provided with a lower drain valve V
  • the fixed double-bed ion exchange water treatment device / resin regeneration device of the present invention is characterized in that the regeneration wave lower row system is added at the interface between strong and weak resins.
  • the lower row system is located 200 m above the bottom of the strong resin layer B to 200 mm below the top of the weak resin layer.
  • the total loading height of the resin in the device of the present invention is generally 1-0-3.5 meters, accounting for 50-100% of the entire device column, wherein the height of the weak resin layer A is 0.5-3 0 meters, the height of the strong resin layer B is 3.0-0.5 meters.
  • the device of the present invention omits a large and small backwashing pipe system in vitro.
  • a backwashing step can be performed using a regeneration pipe system, thereby saving equipment investment and plant floor space, and enabling water production effects. better.
  • a peeking window 2 2 was added at the boundary between the two resins (actually installed), and a water sampling device was also installed at the resin boundary to monitor the water quality of the product (Figure Not shown).
  • the regeneration method of the fixed-type double-bed ion exchange resin of the present invention includes the following steps:
  • the regeneration agent used is the regeneration agent commonly used in the prior art, with a concentration of 0.1-3% by weight and a flow rate of 3-10 m / h.
  • the amount of the regenerant used in the pre-regeneration process is 10-90% of the total amount.
  • This step has three effects: backwash, delamination and pre-regeneration.
  • the strong resin is easy to be regenerated, so that the weak resin is first converted to a recycled type. At this time, its wet true density is close to the minimum state, and most of the strong resin still remains in the invalid state, that is, the wet true density is the largest state. The difference between the wet true density of the strong and weak resins is the largest, so the delamination is the most thorough.
  • the valves v 2 and v 5 are closed to stop inputting and outputting the regeneration solution, and the regeneration solution is allowed to stand in the bunk bed for 1 to 30 minutes to soak the resin to further regenerate the weak resin and further shrink the volume. And settle.
  • the volume of the strong resin expands after regeneration, and its expansion height can compensate for the water space generated by the weak resin's further contraction, so that the pressure-pressing layer of the upper row system 15 or more acts as a top pressure, thereby preventing the resin.
  • the regeneration solution has a concentration of 1-10% by weight and a regeneration flow rate of 2 "6 m / h.
  • a non-top pressure method can be used during the counter-current regeneration, thereby saving the amount of water held during the water top pressure or the air to be pressed during the air top pressure.
  • the conventional pressing method can also be used for regeneration.
  • the resin layer is washed stepwise with a positive rinse.
  • the flushing flow is 5 "I 5 meters / hour, and the time is 1-2 0 minutes.
  • the flushing flow rate is 5-15 m / hour and the time is 5-60 minutes.
  • the bottom row valve V 7 is opened and the valve V 4 is closed at the same time, and the entire resin layer is subjected to a positive wash (known as a large positive wash).
  • the flushing flow rate is 10 to 30 m / hour and the time is 5 to 30 minutes.
  • the resin layer fruit is washed step by step, which can more completely remove the resin layer, especially the dirt adsorbed by the resin layer in the middle; thereby not only improving the quality of the produced water, but also saving the water used for flushing. the amount.
  • Fig. 1 is a schematic diagram of a fixed-type double-bed ion-exchange permanent-treatment device / resin regeneration device of the present invention. Best Mode of the Invention
  • Example 1 A double-bed cation exchange column with a diameter of 2 meters, a height of a cylindrical section of 3 meters, and a total resin loading of 2 meters, of which 0 0 1 X7-SF strong acid cation resin is 1-1 meters high.
  • D 1 1 3-S C weak acid cation exchange resin is 0.9 meters high.
  • 0.9 m 3 of industrial hydrochloric acid was formulated into a solution with a concentration of 1.0% (weight, the same applies hereinafter) as a pre-regeneration solution, with a flow rate of 7 m / h
  • the bottom-bed resin was backwashed and stratified from bottom to top-pre-regeneration; after the pre-regeneration solution was passed in, it was left to stand for 20 minutes; and 0.9 m 3 of industrial hydrochloric acid was formulated to a concentration of 2 .
  • Example 2 A double-bed anion exchange column with a diameter of 2 meters, a cylindrical section height of 3 meters, and a total resin height of 2 meters, of which 2 0 X7-SF strong base anion resin '0. 9 meters high, D 3 0 1 -SC Weak Anion Resin ⁇ 1.1m.
  • the parameters of the positive washing are: the flow rate of the small positive washing is 10 m / h, and the time is 5 minutes; the flow rate of the medium positive washing is 10 m / h, and the time is 15 minutes; the flow rate of the large positive washing is 20 m / h, and the time is 8 Minutes; regeneration ratio ⁇ is 1. 15.
  • Example 3 A double-bed cation exchange column with a diameter of 2.2 meters, a cylindrical section height of 4 meters, and a total resin loading height of 2.6 meters, where 0 0 1 X7 -SF is 1.2 meters high and D 1 1 3 -SC is 1.4 meters high, and the lower row is installed at 0.2 meters on the resin interface.
  • the parameters of the positive wash are: small positive wash flow rate is 10 m I, time is 5 minutes; medium positive wash flow rate is 1 0 m / h, time is 20 minutes; Dazheng washing flow rate is 25 m / h, time is 10 minutes, regeneration ratio ⁇ is 1.05.
  • the water source is river water, a double anion exchange column with a diameter of 2.5 meters, a circular column section of 4 meters in height, and a total resin loading height of 2.58 meters, of which 21 1 X7-SF strong alkali anion resin is high ⁇ .0 meters, D3 0 1-SC weak alkali anion resin is 1.58 meters high, the bottom row is at the resin interface.
  • Regenerative backwash layering Allow the pre-regenerative solution to stand for 15 minutes after passing through; then 0.5 m 3 of industrial burn-in is formulated into a 2.0 % solution as a regeneration solution, with a flow rate of 3.5 m / h Regenerate the resin; then rinse with water for 25 minutes; finally, perform the main washing, the parameters are: Xiaozheng washing flow fan 10 m / h, time 5 minutes; Zhongzheng washing flow speed 10 m / h, time 1 5 minutes; Dazheng washing flow rate is 20 m / h, time is 5 minutes, regeneration specific consumption is 1. 25, C OD removal rate is 61%, The C OD regeneration elution rate was 98%.
  • Embodiment 5 The water source is surface water, a double-layer cation exchange column, with a diameter of 2 meters, a circular column section of 3.2 meters in length, and a total resin of 2.0 meters, in which 0 0 1 X7 — SF height 1. 4 5 Meters, D l 1 3 -SC ⁇ 0.55 meters, the lower row of nests is located at 0-5 m below the resin interface.
  • the parameters are: the small positive wash flow rate is 10 m / h, the time is 5 minutes and 4 times; the medium positive wash flow rate It is 10 m / h, time is 12 minutes; Dazheng washing flow rate is 25 m / h, time is 5 minutes, and regeneration ratio ⁇ is 1.
  • Example 6 The source is surface water, the diameter of the double-layer anion exchange column is 2.0 meters, the diameter of the circular column section is 5 meters, and the total height of the resin is 3.2 meters, of which 20.1 X7-SF is 1.4 meters high, and D3 0 1-FC is 1.8 meters high, and the lower row is installed at 0.4 meters below the resin interface.
  • the parameters are as follows: the flow rate of small positive washing is 10 m / h, and the time is 5 minutes; / h, time is 35 minutes; Dazheng washing flow rate is 25 m / h, time is 8 minutes, regeneration ratio ⁇ is 1.2, C OD removal rate is 68%, C OD regeneration elution rate is 9 9 %. Profit requirements
  • a method for regenerating an ion exchange resin in a fixed-type double-bed water treatment device characterized in that the method includes the following steps:
  • Dilute regeneration solution is passed from the bottom of the double-bed ion exchange resin at high speed from bottom to top to pass through the double-bed ion exchange resin at high speed, and the resin therein is backwashed-pre-regenerated and discharged from the top of the device Regeneration waste waves, wherein the concentration of the regeneration solution used is 0.1 to 3% (weight, the same applies hereinafter), and the flow rate is 3 to 10 m / h.
  • the amount of the regeneration agent in this step can be 1% of the total amount. 0-9 9%;
  • the resin in the upper position of the upper resin layer is rinsed with water from top to bottom.
  • the rinse water is discharged from the upper position of the upper resin layer, and then the upper resin layer is rinsed in the above manner.
  • the position between the lower resin layers is discharged, and finally the entire bunk bed is subjected to forward washing.
  • a fixed type double-bed ion exchange resin water treatment device / resin regeneration device which includes inlet and drainage devices at the top and bottom of the device, a casing, an upper row device for regeneration, and a weak acid located at an upper position in the casing.
  • (Alkaline) resin layer and a strong acid (alkali) resin layer located in the lower part of the casing which are characterized in that a lower row device for regeneration and a resin layering peep are provided at (lower) the two resin interfaces in the cavity of the casing. window.
  • the loading height of the resin layer in the device is 1.0 to 3.5 m, wherein the degree of the weak acid (alkali) resin layer is 0.5 to 3.5. 0 m, Strong acid (minus) The height of the resin layer is 3 ⁇ 0-0 ⁇ 5 m.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

Procédé de régénération de résines dans un appareil échangeur d'ions du type à deux lits fixes, et appareil pour sa mise en ÷uvre. Ledit procédé de régénération consiste à mettre une solution étendue de régénération en écoulement vers le haut dans l'appareil afin de réaliser un lavage à contre-courant et une régénération préliminaire des résines; à plonger de manière statique lesdites résines dans ladite solution étendue de régénération; puis à mettre une solution relativement concentrée de régénération en écoulement vers le haut dans l'appareil afin de réaliser une régénération supplémentaire des résines; à mettre de l'eau en écoulement vers le haut dans l'appareil afin de remplacer ladite solution concentrée de régénération, et enfin à mettre de l'eau en écoulement vers le bas dans l'appareil afin de laver la partie supérieure de la couche supérieure de résine, la couche supérieure de résine, et les deux couches de résine l'une après l'autre. Ledit appareil est caractérisé en ce qu'un dispositif inférieur d'évacuation pour la régénération est monté au-dessus ou au-dessous de l'interface entre les deux couches de résine.
PCT/CN1995/000021 1994-03-30 1995-03-30 Procede et appareil de regeneration de resines dans un appareil echangeur d'ions du type a deux lits fixes WO1995026821A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19581621T DE19581621T1 (de) 1994-03-30 1995-03-30 Verfahren und Einrichtung zum Regenerieren von Ionenaustauschharzen in einer Vorrichtung mit ortsfestem Doppelbett
AU21081/95A AU2108195A (en) 1994-03-30 1995-03-30 Process and apparatus for regeneration of resins in fixed double-bed type
US08/716,197 US5955510A (en) 1994-03-30 1995-03-30 Process for the regeneration of ion exchange resins in a fixed double-bed type apparatus
GB9620404A GB2303802B (en) 1994-03-30 1995-03-30 Process and apparatus for the regeneration of resins in a fixed double-bed type apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN94240045.3 1994-03-30
CN 94240045 CN2198264Y (zh) 1994-03-30 1994-03-30 新型双层床设备
CN94119829.4 1994-12-12
CN94119829A CN1107808A (zh) 1994-12-12 1994-12-12 水处理除盐系统中双层床的再生方法

Publications (1)

Publication Number Publication Date
WO1995026821A1 true WO1995026821A1 (fr) 1995-10-12

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PCT/CN1995/000021 WO1995026821A1 (fr) 1994-03-30 1995-03-30 Procede et appareil de regeneration de resines dans un appareil echangeur d'ions du type a deux lits fixes

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US (1) US5955510A (fr)
AU (1) AU2108195A (fr)
DE (1) DE19581621T1 (fr)
GB (1) GB2303802B (fr)
WO (1) WO1995026821A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358421B1 (en) 2000-04-18 2002-03-19 United States Filter Corporation Method for countercurrent regeneration of an ion exchange resin bed
GB2383275A (en) * 2001-12-22 2003-06-25 Plc Accentus Ion exchange column regeneration by electrodialysis
ITMI20020106A1 (it) * 2002-01-22 2003-07-22 Tm E S P A Termomeccanica Ecol Impianto a resine a scambio ionico
US20050103717A1 (en) 2003-11-13 2005-05-19 United States Filter Corporation Water treatment system and method
US7083733B2 (en) 2003-11-13 2006-08-01 Usfilter Corporation Water treatment system and method
US8377279B2 (en) 2003-11-13 2013-02-19 Siemens Industry, Inc. Water treatment system and method
US7658828B2 (en) 2005-04-13 2010-02-09 Siemens Water Technologies Holding Corp. Regeneration of adsorption media within electrical purification apparatuses
US20080067069A1 (en) 2006-06-22 2008-03-20 Siemens Water Technologies Corp. Low scale potential water treatment
BRPI0819884A2 (pt) 2007-11-30 2016-05-10 Siemens Water Tech Corp método para tratamento de água salgada, sistema de tratamento de água e dispositivo de separação acionado eletricamente
WO2011027213A2 (fr) * 2009-09-06 2011-03-10 Earth Metallurgical Solutions (Pty) Limited Appareil destiné au traitement d'un effluent
CN105080624B (zh) * 2015-09-10 2018-04-10 舒城联科环境科技有限公司 一种离子交换树脂再生方法
KR101821295B1 (ko) * 2017-05-15 2018-01-23 한국기계연구원 이온교환수지 컬럼 장치 및 이의 운전 방법
CN114345423B (zh) * 2022-01-21 2023-12-08 欧尚元智能装备有限公司 一种连续离交树脂复苏方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582504A (en) * 1970-04-20 1971-06-01 Ecodyne Corp Method for separating and isolating ion exchange resins
US3617558A (en) * 1970-11-02 1971-11-02 Illinois Water Treatment Co Layered ion exchange process
US3711401A (en) * 1971-03-08 1973-01-16 Sybron Corp Regeneration method for dual beds of ion exchange resins

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531401A (en) * 1968-01-23 1970-09-29 Crane Co Method of regenerating ion exchangers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582504A (en) * 1970-04-20 1971-06-01 Ecodyne Corp Method for separating and isolating ion exchange resins
US3617558A (en) * 1970-11-02 1971-11-02 Illinois Water Treatment Co Layered ion exchange process
US3711401A (en) * 1971-03-08 1973-01-16 Sybron Corp Regeneration method for dual beds of ion exchange resins

Also Published As

Publication number Publication date
DE19581621T1 (de) 1997-04-24
AU2108195A (en) 1995-10-23
GB2303802B (en) 1997-12-24
US5955510A (en) 1999-09-21
GB9620404D0 (en) 1996-11-13
GB2303802A (en) 1997-03-05

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